Hymenostome

The hymenostomes are an order of ciliate protozoa. Most are free-living in freshwater, such as the commonly studied genus Tetrahymena, but some are parasitic on fish or aquatic invertebrates. Among these is the important species Ichthyopthirius multifiliis, a common cause of death in aquaria and fish farms. The hymenostomes are fairly typical memb...
Found on http://en.wikipedia.org/wiki/Hymenostome

hymenostome

any member of the evenly ciliated protozoan order Hymenostomatida. Included in this order are the genus Paramecium, often used in laboratory ...
Found on http://www.britannica.com/eb/a-z/h/90
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